The invention refers to switching a physical quantity, wherein the switching is performed by a switching element (SW) according to a control signal received from a control circuit (11), comprising detecting from the control signal (CS) a first number indicative of a time length, and a second number indicative of a point in time, generating a switching signal (S) comprising a switching pulse having a pulse length according to the time length and a pulse position according to the point in time, and providing the switching signal to the switching element (SW). The invention further refers to a power amplifier and to a corresponding computer program.